a person, usually a yoga enthusiast, who live and breathes the brand lululemon (purveyor of well-made and ludicrously priced sportswear). Might be seen wearing $100 yoga pants and $20 headbands while scrounging for gas money. See lululemon.com.
"Who was that girl in those fabulous yoga clothes?"
"That's Jenny. She wears nothing but lululemon, but she's stone broke. What a lululemming."